258 Valerian defeated and captured by the
Persians. Postumus establishes an _imperium
Galliarum_.
259 Valerian dies in captivity. Gallienus sole
emperor.
267 Sack of Athens by the Goths.
268-270 CLAUDIUS GOTHICUS.
270 QUINTILLUS.
270-275 AURELIANUS.
271 Revolt of Palmyra.
272 Reconquest of Palmyra and the East.
274 Recovery of Gaul and Britain.
275-276 TACITUS.
276 FLORIANUS.
276-282 PROBUS.
282-283 CARUS.
283-285 CARINUS.
284-305 DIOCLETIANUS and
286-305 MAXIMIANUS.
286 Revolt of Carausius in Britain.
293 Galerius and Constantine Caesars.
296 Recovery of Britain.
297 Persian invasion.
301 Edict of Prices.
302-304 Edicts against the Christians.
305 Abdication of Diocletian and Maximian.
Galerius and Constantius. Severus and Daia
Caesars.
306 GALERIUS and SEVERUS. Constantinus Caesar.
Revolt of Maxentius.
307 GALERIUS, LICINIUS, CONSTANTINUS, DAIA and
MAXENTIUS.
311 Edict of Toleration.
312 Battle of Saxa Rubra.
313 Edict of Milan. Fall of Daia.
324 Battle of Chrysopolis.
324-337 CONSTANTINUS sole Augustus.
325 Council of Nicaea.
330 Constantinople the imperial residence.
337-340 CONSTANTINUS II.
337-350 CONSTANS.
337-361 CONSTANTIUS.
342 Council of Serdica.
350 Revolt of Magnentius.
351 Gallus Caesar. Battle of Mursa.
354 Death of Gallus.
355 Julian Caesar.
357 Julian's victory over the Alemanni at